03-18-2010, 01:12 PM
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It could have been Lisa, it is recommended that you drop nitrate no more than 5-10ppm at a time by making small percent water changes and increasing the percent each day until you reach 50% and 5-10ppm nitrate.
Some fish are more sensitive than others and the time they spend in the high nitrate plays a role too, pH also can be a factor in regards to sudden changes.
IMO 30ppm is right on the edge in that caution area, most fish handle those slow rise in the nitrate and will be just fine, however, it will affect their immune response.
When you have high nitrate you also need to find out why, reason....not enough water water changes i.e. frequency, low percent, poor substrate vacuuming, overstocked, over feeding, dirty filter or poor flow are a few reasons.
Nitrates are the lesser of the evils but they can have adverse effects at high levels